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Digest::HMAC is a perl module used for message integrity checks between twoparties that share a secret key, and works in combination with some otherDigest algorithm, usually MD5 or SHA-1. The HMAC mechanism is describedin RFC 2104.

The Digest::HMAC module follow the common Digest:: interface, but theconstructor takes the secret key and the name of some other simple Digest::module as argument.